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The 34700 is a compact, high-efficiency power supply with on-chip power MOSFETs that features three step-down switching regulators and one low dropout linear regulator. The switching regulators utilize voltage mode control with external compensation, allowing flexibility in optimizing the performance of the 34700 for a given application.

The 34700 is ideal for space constrained applications where multiple power rails are required and simplicity of design and implementation of the power supply is necessary. Over-voltage, under-voltage, over-current, and over-temperature protection features ensure robust and reliable operation. Fixed switching frequency, internal soft-start, and internal power MOSFETs enable rapid power supply design and development

Features

? Three switching regulators: 2 synchronous and 1 non synchronous

? One low dropout linear regulator

? Output current capability:

? 1.5 A continuous on channel 1

? 1.25 A continuous on channels 2 and 3

? 400 mA continuous on channel 4

? Internal power MOSFETs on all channels

? Voltage feed-forward on channel 1

? ±1.5 Output voltage accuracy on all channels

? Cycle-by-cycle current limit and short-circuit protection

? Fixed 800 kHz switching frequency

? Internal soft-start

? Over-voltage, under-voltage and over-temperature protection

? Open-drain power-good output signal

? Separate active-high enable input for each channel

? Pb-free packaging designated by suffix code EP

Typical Applications:

? Set Top Boxes and Receivers

? Cable Modems

? Networking Cards

? Telecom Line Cards